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Unsubtyping has to propagate a `subtypesExposedToJS` marker from supertypes to subtypes. It previously did this by propagating from supertype to subtype whenever a new subtyping relationship was found. But subtyping trees are not always built from top to bottom. In cases where the newly discovered subtype already had subtypes, the previous propagation scheme would fail to propagate to those transitive subtypes. Fix the problem by propagating to the full subtype tree rooted at a newly discovered subtype. Use a DFS over the tree and avoid traversing subtrees that have already been marked to avoid introducing possible quadratic behavior.
kripken
approved these changes
Mar 16, 2026
| ;; CHECK-NEXT: (unreachable) | ||
| ;; CHECK-NEXT: ) | ||
| (@binaryen.js.called) | ||
| (func $expose-structref (result anyref) |
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| (func $expose-structref (result anyref) | |
| (func $expose-anyref (result anyref) |
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Unsubtyping has to propagate a
subtypesExposedToJSmarker from supertypes to subtypes. It previously did this by propagating from supertype to subtype whenever a new subtyping relationship was found. But subtyping trees are not always built from top to bottom. In cases where the newly discovered subtype already had subtypes, the previous propagation scheme would fail to propagate to those transitive subtypes.Fix the problem by propagating to the full subtype tree rooted at a newly discovered subtype. Use a DFS over the tree and avoid traversing subtrees that have already been marked to avoid introducing possible quadratic behavior.